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Air Jet Tester for Keyboards

IP.com Disclosure Number: IPCOM000043482D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Akam, NJ: AUTHOR [+4]

Abstract

A keyboard 1 carrying plural rows of keys 2 in a configuration in which the keys of each row have the same axis of depression, but the axial depression directions of the respective rows are convergent, is tested for correct operation by a processor-controlled tester 3 which includes two pivotally mounted frames 4 and 5 having a common axis of rotation 6, located along the line of intersection of the key depression axes of a keyboard mounted in the tester. The frames extend substantially to the exposed surfaces of the keys and carry air jet nozzles 7. Each nozzle is connected by an individual hose 8, only the end of which of each frame being shown, to a corresponding solenoid-controlled valve 9 connecting, in turn, to a compressed air supply (not shown).

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Air Jet Tester for Keyboards

A keyboard 1 carrying plural rows of keys 2 in a configuration in which the keys of each row have the same axis of depression, but the axial depression directions of the respective rows are convergent, is tested for correct operation by a processor-controlled tester 3 which includes two pivotally mounted frames 4 and 5 having a common axis of rotation 6, located along the line of intersection of the key depression axes of a keyboard mounted in the tester. The frames extend substantially to the exposed surfaces of the keys and carry air jet nozzles 7. Each nozzle is connected by an individual hose 8, only the end of which of each frame being shown, to a corresponding solenoid-controlled valve 9 connecting, in turn, to a compressed air supply (not shown). The solenoids are controlled by the processor, as are the stepping motors 10 and 11 which respectively rotate and axially displace the frames (via belt and pulley drives and a sectional lead screw). During test, the keys of a keyboard are electrically connected back to the testing processor, which drives the frames back and forth over the exposed surfaces of the keys, opening and closing the air valves by means of the solenoids to generate a known pattern of key depressing air jets which impinge on the exposed key surfaces centrally. If all is well, the electrical signals fed back to the processor from the depressed keys should replicate the known pattern. The air jet nozzles of one or...